I hope you are also getting the care you need, alongside these stories! No harm in living for the little things, the big ones will come your way too... if you can't have access to a therapist or even a good school counseller, people have made do for centuries before with religion and herbal remedies like St. John's Wort (this can be bought without a prescription, if you're not on any antidepressant drugs or medications that could interact badly—read about it, privately consult your doctor, be careful!)
Angel Beats!, if you can get past the wackiness and tolerate moe, is all about a bunch of unfulfilled kids coming to terms with their lives and moving bravely forward. At first, they're lost and VERY resistant, but they each find a little of what they need and the courage to move on.
A very cute and very funny show, the kids are goofy and playful teens, the comedy makes them relatable and helps it from feeling too heavy. It can be bloody, humour can be morbid.
Haibane-Renmei is a more serious story, slow-paced and calming in the second half, about angelic people hatched from a cocoon, with only a dream to identify with and link to their previous existence... living in a walled-off city where they know nothing of what lies beyond it, even books on religion and geography are denied to them.
The second half deals with one of these characters finally taking flight and leaving, the others mourn, and one falls into the depths of depression... a very heavy watch in the second half (it might not be the best to watch while suicidal, but others have had it help them—the author wrote it very honestly from his feelings of "salvation" on recovering from depression), but ultimately life-affirming.
The only warning aside from that is the process of growing wings is bloody and painful. One instance of body horror in the first episode. One act of bird-like self-harm in cutting own feathers (albeit with scissors)...
The movie Colorful is also about finding meaning in life, a soul gets another shot at life and an "angel" helps?
Fruits Basket is very beautiful and healing, with a lot of comedy and cute shoujo romantic elements so far. It has a vibrant cast, an intriguing mystery, and promises to go darker later, as each character had their own traumas and anxieties and issues to overcome. There's a beautiful reboot currently airing!
The manga is complete and very inspirational and fondly remembered by its fans, the new reboot plans to cover the whole story!